Cartridge insert for a dispensing nozzle

ABSTRACT

A fluid dispensing nozzle cartridge for providing two fluid paths through two separate passages extending through the cartridge supported in a passage in the nozzle body is disclosed. The cartridge has a valve supported at the outlet end of the passages with the valve having a separate portion controlling each of the passages. When there is flow through only one of the passages in the cartridge, the portion of the valve cooperating therewith is opened by the fluid flow and the portion of the valve cooperating with the other passage is biased closed to insure that there is no significant leakage from the nozzle into the passage in the cartridge not having pressurized fluid supplied thereto.

United States Patent Wilder et al.

[54] CARTRIDGE INSERT FOR A DISPENSING NOZZLE [72] Inventors: Paul R. Wilder, Cincinnati, Ohio; Donald L. Smallwood, Fort Mitchell,

[73] Assignee: Dover Corporation, New York, NY.

[22] Filed: July 12, 1971 21 Appl. No.: 161,571

[52} US. Cl ..222/482, 222/488 [51] Int. Cl. ..B67d 3/00 [58] Field of Search ..222/25-28, 74,

[56] References Cited UNITED STATES PATENTS 106,433 8/1870 Van Keuren ..137/512.4 X 2,743,843 5/1956 Bliss ..'.222/26 2,886,211 5/1959 McGaughey et a1 ..222/26 3,208,472 9/1965 Scaramucci ..137/512.15 X 3,606,096 9/ l 969 Campbell ..222/153 Dec. 5, 1972 FOREIGN PATENTS OR APPLlCATlONS 4/1961 Great Britain ..222/26 Primary Examiner-M. Henson Wood, Jr. Assistant Examiner-Edwin D. Grant Attorney-J. Warren Kinney, Jr. et al.

[5 7] ABSTRACT A fluid dispensing nozzle cartridge for providing two fluid paths through two separate passages extending through the cartridge supported in a passage in the nozzle body is disclosed. The cartridge has a valve supported at the outlet end of the passages with the valve having a separate portion controlling each of the passages. When there is flow through only one of the passages in the cartridge, the portion of the valve cooperating therewith is opened by the fluid flow and the portion of the valve cooperating with the other passage is biased closed to insure that there is no significant leakage from the nozzle into the passage in the cartridge not having pressurized fluid supplied thereto.

10 Claims, 9 Drawing Figures PATENTED nu: 5 i912 SHEET 2 BF 2 64 8O FIG.9

IN PAUL R. WI

ORS 8:

LWOOD VENT LDER DONALD L.S AL

ATTORNEYS BACKGROUND OF THE INVENTION This invention relates generally to fluid dispensing nozzles and more particularly to a dispensing nozzle having a cartridge insert to permit separate dispensing of different fluids while preventing contamination of the other fluid. a

The blending or mixing of two gasolines having different octanes has previously been suggested. However, the mixing of the two gasolines of different octanes generally has been accomplished in such a manner that portions of one of the octane gasolines can remain in an area in which it will be utilized when a different octane gasoline is to be supplied.

This type of contamination does not present any significant problem where the two gasolines being mixed are only gasolines of different ocatanes.

A problem arises with leaded and non-leaded gasoline since the engines of many older automobiles require leaded gasolines while newer model automobiles have engines designed for non-leaded gasoline. Accordingly, to enable service stations to be able to economically sell gasoline having lead of different amounts and gasoline not having lead, it would be desirable to dispense all gasolines from a single nozzle wherein the leaded and non-leaded types of gasoline can be mixed or blended when leaded gasoline is required and to supply only the non-leaded gasoline when such is required. However, to accomplish this, it is necessary that there can be no contamination by the v leaded gasoline when only non-leaded gasoline is to be supplied.

The present invention satisfactorily solves the foregoing problem by providing a nozzle cartridge insert in which there is no communication between the passage supplying leaded gasoline and the passage supplying the non-leaded gasoline when only one of the passages is supplying gasoline. Accordingly, there will be no significant contamination of the non-leaded gasoline in a fluid dispensing nozzle utilizing the nozzle cartridge insert of the present invention.

Another problem in the prior devices for mixing gasolines for use with a dispensing nozzle is that mixing occurred exterior of the inlet to the nozzle whereby some mixed gasoline remained in the nozzle body when flow was stopped. Furthermore, the nozzle body or housing had a significant volume within which gasoline remained when flow was stopped.

This problem is reduced by the present invention as there is only a small portion of the entire volume within the nozzle body or housing in which gasoline remains when flow is stopped. While the remaining gasoline does flow through the outlet spout of the nozzle when flow starts, the volume is so small that it does not signiticantly affect the engine of the vehicle having the gasoline supplied thereto.

Accordingly, by reducing the volume in the nozzle body between the outlets of the passages supplying the two types of gasoline and the valves controlling the flow of the mixed gasoline through the dispensing nozzle, the present invention prevents any significant contamination even when a small quantity of gasoline is purchased. In the prior devices for mixing two types of gasolines, the volume between the outlets of the passages supplying the gasolines and the positions of the control valves would result in the remaining gasoline significantly contaminating the new gasoline if only a small quantity of gasoline were purchased.

Therefore, an object of this invention is to provide a fluid dispensing nozzle in which mixing or blending of different fluids occurs.

Another object of this invention is to provide a cartridge insert for a fluid dispensing nozzle to enable blending or mixing of different fluids within the nozzle.

A further object of this invention is to provide a fluid dispensing nozzle having a cartridge insert which permits delivery of different types of fluid therefrom with minimum cross-contamination of the fluids.

SUMMARY OF THE INVENTION This invention provides an improved cartridge insert for a dispensing nozzle which permits the dispensing of different fluids from the nozzle with minimum chance of cross-contamination to either fluid. The cartridge insert is of simple and economical construction, has few moving parts, and has great versatility in use. The cartridge insert is adapted to be placed inside the handle of a dispensing nozzle such that no part thereof is exposed exteriorly of the handle. The nozzle flapper valve attached to the outlet end of the cartridge is biased to the closed position around the outer periphery of the valve so as to form a substantially contamination free seal.

Other objects, details, uses, and advantages of this invention will become apparent as the following descrip tion of an exemplary embodiment thereof presented in the accompanying drawings proceeds.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings show a present exemplary embodiment of this invention in which:

FIG. 1 is an elevational view, partially in cross sec tion, of a fluid dispensing nozzle having the cartridge insert of the present invention;

FIG. 2 is a sectional view of the cartridge insert of the present invention;

FIG. 3 is an end elevational view of the cartridge insert of FIG. 2 at the outlet end thereof;

FIG. 4 is an end elevational view of the inlet end of the cartridge insert of FIG. 2;

FIG. 5 is a sectional view of the cartridge insert taken along line 5-5 of FIG. 2;

FIG. 6 is a sectional view of the cartridge insert taken along line 6-6 of FIG. 2;

FIG. 7 is an elevational view of the flapper valve of FIG. 3;

FIG. 8 is a sectional view of the flapper valve taken along the line 8--8 of FIG. 7; and

FIG. 9 is a side elevational view of the flapper valve retainer.

DESCRIPTION OF ILLUSTRATED EMBODIMENT Reference is now made to FIG. 1 of the drawings, which illustrates an exemplary embodiment of an automatic fluid dispensing nozzle which is designated generally by the reference numeral 10. The nozzle has an inlet 12 and an outlet 14. A lever or handle 16 controls the raising and lowering of a stem 18 which opens and closes a poppet valve in a known manner so as to permit the flow of fluid from the inlet end 12 to the outlet end 14. A cartridge insert generally designated as 20 is disposed within the annular housing 22 of the inlet end 12. The housing 22 has an enlarged diameter portion 24 internally threaded at 26. The intemal' threads 26 are adapted-to receive a complementary threaded end portion of a hose 28. Hose 28 is secured to the nozzle 10 through the use of any suitable means such as a ferrule. Thus, it is seen that the cartridge insert 20 is disposed entirely within the housing 20 and 24.. No portion of the cartridge insert is exterior of the nozzle 10.

The cartridge insert 20 is urged inwardly in the housing 22 by a spring 32. Spring 32 acts at one end against the terminal end of the hose 28 and at its other end against the annular body of the cartridge insert 20. The cartridge insert is urged forwardly in the housing 22 until the outlet end thereof abuts against an annular shoulder 34 formed on the inner wall of the housing 22. An O-ring 36 forms a seal between the housing 22 and the cartridge insert 20.

The cartridge insert 20 is formed with a cylindrical outer housing 38 which defines an inlet 40 to an arcuate passage 42 (FIGS. 2 and A cylindrical housing 46 of a lesser diameter than housing 38 forms the inlet 54 for a second and separate flow passage to be described hereinbelow. The cylindrical housing 46 terminates in a divider portion 60 at the outlet end of the insert 20. The housing 38 and a portion of housing 46 define the walls of passage 42. The divider 60 and the housing 38 define a passageway 44 which is in communication with passage 42 and inlet 40. It is thus seen that there is flow communication between fluid delivered through hose 28 and passages 42 and 44.

The housing 46 is formed at its inlet end 54 with a flared portion 48. The flared end 46 cooperates with a clamp 52 to secure a second hose 50 to the housing 46. Hose 50 supplies a fluid different from that supplied by hose 28 to the cartridge insert 20. Hose 50 is in communication with passages 56 and 58 defined by the cylindrical housing 46 andthe housing 38 and divider 60, respectively.

The communication between passages 58 and 44 with the outlet 14 of nozzle (FIG. l) is controlled by a flapper valve 62. Referring specifically to FIGS. 2, 3, 7, and 8, it is seen that the cylindrical flapper valve 62 has a thin central portion 64 with an outer portion 66 of semi-circular shape on one side of the central portion 64 and an outer portion 68 of semi-circular shape on the other side of the central portion 64. Projecting outwardly from portions 66 and 68 are protrusions 70 and 72, respectively. The protrusions 70 and 72 serve to position a garter spring 74 relative to the valve 62 so that the bearing pressure from the spring is urged on the outer periphery of the valve 62. In this way, the movement of the valve is controlled but not restricted. The retainer 76 is formed with a pair of slots or grooves 80 which receive the spring 74 and position the spring relative thereto. A pair of apertures 78 extend through the retainer 76 and are similar in position to apertures 82 formed in the central portion 64 of the valve 72 (FIG. 7). Screws 82 extend through apertures 78 and 82 to secure the flapper valve assembly 62 to the end of the divider 60.

The outer portion 66 (FIG. 2) prevents communication between the passage 58 and a passage 84 (FIG. 1)

unless pressurized fluid is flowing through the passage 58. Similarly, the outer portion 68 prevents communication between the passage 44 and the passage 84 unless pressurized fluid is flowing through the passage 44.

By forming the valve 62 of a suitable resilient material and making the central portion 64 relatively thin in comparison with the thickness of each outer portions 66 and 68, there is a hinging effect so that the outer portion 66 can be opened when pressurized fluid is flowing through only the passage 58 and the outer portion 68 can be opened when the pressurized fluid is flowing through only the passage 44. One suitable example of the material of the-valve 62 is a low swell buna-N rubber.

As either portion 66 or 68 is opened against the spring force 74, the force required to overcome the closing effect of the spring 74 on the portion of the valve 62 being opened is transmitted to the other portion of the valve. Accordingly, as one side of the valve is opened, the other side of the valve is urged into a tighter closed position by the spring 74 which insures that there is no cross-contamination between passages 58 and 44 when only one of said passages is opened for flow therethrough. The seal 36 (FIG. 1) prevents contamination of fluid form hose 28 to the passage 84. Thus, it can be seen that there is no chance for contamination of flow of the fluids from hose 50 with the fluid from hose 28 with the cartridge insert 20 mounted within the nozzle 10.

The diameter of the flapper valve 62 is less than the diameter of the housing 38. Referring now to FIG. 1, it is seen that the flapper valve .62 extends downstream of the shoulder 34 and protrudes into the passageway 84. The volume of the passage 84 is thus reduced by the volume of the flapper valve 62 so that any fluid remaining in the passage 84 after the valve 62 has been closed is reduced by the volume of the valve 62.

Each hose 28 and 50 is connected to a separate source of a fluid. The fluids are supplied under pressure by a pump (not shown) through the hose 28, passages 42-44 and hose 50, respectively, to the passage 84.

With this arrangement, leaded gasoline could be supplied through the hose 28 and non-leaded gasoline supplied through the hose 50, for example. This would enable separate flow of the non-leaded gasoline to the nozzle 10 without contamination by the leaded gasoline. Of course, the hoses 28 and 50 could be connected to gasolines of different octanes, for example, rather than to a leaded gasoline and a non-leaded gasoline.

The flow of gasoline from the passage 84 to an outlet spout 14 of the nozzle 10 can occur only when the pivotally mounted lever or handle 16 is moved upwardly to lift a poppet valve 84 (FIG. 1) to an open position. When this occurs, the pressure of the gasoline moves a resiliently biased bleeder popped valve 86 downwardly whereby the gasoline flows from the passage 84 to the outlet spout 14.

When the lever 16 is released, the poppet valve 84 is returned to its closed position to stop flow through the passage 84 to the outlet spout 14. Furthermore, if the vehicle tank, which is being filled, reaches a certain level at which it is substantially filled, the poppet valve 84 is automatically returned to its closed position since the lever 16 has the position of its pivotal connection moved in a manner such as that shown and described in US. Pat. No. 2,582,195 to Duerr.

When the pivotal position of the lever 16 is changed in automatic shut-off or the lever 16 is released, the force of a compression spring 88, which is acting against the poppet valve84, returns the poppet valve 84 to its closed position to stop flow through the nozzle 10. The spring 88 has one end acting against the top of the poppetvalve 84 and its other end engaging a flange 90 to a cuplike member or plug 92. A cap 94,'which is threadedly connected to the nozzle 10, holds the plug 92 in the desired position in cooperation with the spring 88.

The plug 92 reduces the amount of fluid that is retained between the valve 62 and the poppet valve 84 by filling part of the space between the valve 62 and the poppet valve 84. The plug 92 must not extend down so as to retard the upward movement of the poppet valve 84 by the lever 16 lifting a stem 18, which is secured to the poppet valve 84.

The total quantity of gasoline remaining in the nozzle to contaminate gasoline later supplied is very small. Thus, the plug 92 and the position of. the cartridge insert 20 cooperate to significantly reduce the volume of gasoline remaining between the valve 62 and the poppet valve 84. This quantity plus any minute quantity between the valves 84 and 86 is significantly smaller than would occur where mixing occurs prior to the entrance of the housing 24 as in the prior nozzles having mixing arrangements. Likewise, the prior nozzles, which had mixing arrangements, did not reduce the volume prior to the poppet valve 84 as the plug 92 does.

The position of the cartridge insert 20 with respect to the poppet valve 84 is such that either of the outer portions 66 and 68 of the valve 62 may be opened when fluid is flowing through the passage with which the outer portion cooperates. The passage 84 has a larger diameter than the valve 62 to insure that either of the outer portions 66 and 68 of the valve 62 may hingedly move about the thin central portion 64.

Considering the operation of the present invention with gasoline pumped only through the hose 28, there is flow through only the passages 48 and 44 whereby the outer portion 68 of the valve 62 opens to allow communication of the passage 44 with the passage 84.

When the lever 16 is raised upwardly, the poppet valve 84 is opened, and gasoline flows through the nozzle 10 to the outlet spout 14 by moving the bleeder poppet valve 86 to its open position. Flow can be either automatically stopped when the tank becomes filled or by releasing the lever 16.

Similarly, if gasoline is flowing only through the hose 50, then only the passages 56 and 58 communicate with the passage 84. The pressure of the gasoline in the passage 58 opens the outer portion 66 of the valve 62. In each case, the other outer portion of valve 62 is biased closed by spring 74 to prevent any communication between the passage 44 and the passage 58.

if gasoline is supplied through both of the hoses 28 and 50 simultaneously, then there is mixing of the two gasolines in the passage 84. When this occurs, the outer portions 66 and 68 are both opened.

Accordingly, there can be flow through either the passage 44 and 58 or through both of the passages 44 and 58 simultaneously. When there is flow through only one of the passages 44 and 58, there is no contamination of the other of the passages 44 and 58 because of the valve 62.

It can be further seen that the cartridge insert can rotate within the housing 22 while still having a fluid seal between hose 28 and passage 84 due to the O-ring 36. The insert can be manufactured from any material, metal or plastic, having low swell capabilities and resistance to gasoline.

An advantage of this invention is that it prevents contamination of one fluid by a different fluid when each can be supplied to a common chamber at a different time. Another advantage of this invention is that it provides positive sealing of one passage when a second passage has a pressurized fluid supplied thereto and both of the passages communicate with the same chamber.

While a present exemplary embodiment of this invention has been illustrated and described, it will be recognized that this invention may be otherwise variously embodied and practiced by those skilled in the art.

. What is claimed is:

1. A fluid dispensing nozzle including an inlet housing having a passage therein, said inlet housing adapted to cooperatively receive a first fluid hose, a second fluid hose placed coaxially within the first hose, a nozzle outlet, nozzle valve means to control flow through said passage to the nozzle outlet, a cartridge insert mounted within said inlet housing between the first fluid hose and said valve means, said insert defining a first passage having an inlet and an outlet and a second passage having an inlet and an outlet, said insert first passage being in communication with the first hose and said insert second passage being in communication with the second hose, each passage outlet being in communication with said inlet housing passage upstream of said valve means, valve means to prevent flow from one of said first and second insert passages to the other through said housing passage when only one insert passage has pressurized fluid flowing therein to said housing passage, and means normally biasing said valve means closed in the absence of pressurized fluid flowing in said insert passages.

2. The nozzle according to claim 1 including a spring in said inlet housing acting against said cartridge insert to urge said insert downstream, shoulder means in said inlet housing passage to stop the downstream movement of said cartridge insert, and said valve means being supported by said cartridge insert at the outlet end thereof.

3. The nozzle according to claim 2 in which said valve means includes a single valve mounted at the outlet end of said cartridge insert, said valve having a first portion cooperating with the outlet of said first insert passage and a second portion cooperating with the outlet of said first insert passage and a second portion cooperating with the outlet of said second insert passage, said first and second portions being opened in response to pressurized fluid flow in said insert passages, said biasing means including a garter spring acting against said first and second portion, and further including a garter spring retainer mounted on said single valve so as to retain said garter spring on said valve.

4. The nozzle according to claim 3 in which said single valve further comprises first and second protrusions projecting outwardly from said first and second portions for positioning said garter spring thereabouts whereby the biasing force of said garter spring is applied to the outer dimensions of said first and second portions.

5. The nozzle according to claim 2 in which said valve means includes a singleflapper valve mounted at one end of said member, said flapper valve having a thin central portion, a first outer portion adjacent one side of said central portion and a second outer portion adjacent the other side of said central portion, said first and second outer portions increasing in thickness from said central portion outward, a first protrusion projecting outwardly from adjacent the outer extremity of said first portion, a second protrusion projecting outwardly from adjacent the outer extremity of said second portion, said first outer portion cooperating with the outlet of said first insert passage to prevent communication between said first insert passage and i said housing passage in the absence of pressurized fluid in said first insert passage, said second outer portion cooperating with the outlet of said second insert passage to prevent communication between said second insert passage and said housing passage in the absence of a pressurized fluid in said second insert passage, said biasing means including a garter spring mounted about the first and second protrusions and further including a retainer having a pair of channels formed therein, said retainer mounted on said central portion wherein said garter spring is restrained by said channels whereby the spring biasing force is applied at the outer extremity of said first and second portion to close said first and second insert outlets in the absence of pressurized fluid in the respective passages therein.

6. The nozzle according to claim 1 further including a hollow cuplike member disposed in said housing passage between said cartridge insert and said nozzle valve means to reduce the volume in said housing passage in which fluid remains when fluid flow stops.

7. A cartridge insert for use with a fluid dispensing nozzle to permit the nozzle to dispense two different the nozzle inlet passage downstream of the first hose, said annular housing defining a first cartridge inlet, said first inlet being in communication with said first hose, a second housing of lesser diameter than said first housing, said second housing defining a second inlet and adapted to cooperatively engage the end of the second hose, a dividing wall providing separate passages within said first annular housing, the first passage being in communication with said first inlet and the second passage being in communication with said second inlet, each passage having an outlet at the downstream end of said insert, a valve mounted at the downstream end of said insert to open and close said first and second passage outlet in response to pressurized fluid therein,

means normallylbiasing said valve closed in the absence of pressurized u 1d in he passages to prevent comm unication between said passages when pressurized fluid is not present in both passages. g

8. The cartridge insert according to claim 7 in which said biasing means includes a garter spring, and in which said valve includes a single cylindrical flapper valve having a thin central portion, a first outer portion adjacent one side of said central portion and a second outer portion adjacent the other side of central portion, said first and second outer portions having a greater thickness than said central portion, a first protrusion projecting outwardly from adjacent the outer extremity of said first portion, a second protrusion projecting outwardly from adjacent the outer extremity of said second portion, said first and second protrusions cooperatively positioning said garter spring on said flapper valve, a retainer having a pair of slots formed therein to receive and restrain said garter spring when said retainer is secured to said central portion wherein the spring biasing force is applied at the outer extremity of said first and second portions by said garter spring whereby said first outer portion cooperates with said first passage outlet to close said outlet and whereby said second outer portion cooperates with said second outlet passage to close said outlet and whereby said first and second passages are only in communication with each other when there is pressurized fluid flow in each of said first and second passages.

9. The cartridge according to claim 8 in which said flapper valve is connected to the end of said dividing wall.

10. The cartridge according to claim 9 in which the cylindrical flapper valve is of lesser diameter than said first annular housing. 

1. A fluid dispensing nozzle including an inlet housing having a passage therein, said inlet housing adapted to cooperatively receive a first fluid hose, a second fluid hose placed coaxially within the first hose, a nozzle outlet, nozzle valve means to control flow through said passage to the nozzle outlet, a cartridge insert mounted within said inlet housing between the first fluid hose and said valve means, said insert defining a first passage having an inlet and an outlet and a second passage having an inlet and an outlet, said insert first passage being in communication with the first hose and said insert second passage being in communication with the second hose, each passage outlet being in communication with said inlet housing passage upstream of said valve means, valve means to prevent flow from one of said first and second insert passages to the other through said housing passage when only one insert passage has pressurized fluid flowing therein to said housing passage, and means normally biasing said valve means closed in the absence of pressurized fluid flowing in said insert passages.
 2. The nozzle according to claim 1 including a spring in said inlet housing acting against said cartridge insert to urge said insert downstream, shoulder means in said inlet housing passage to stop the downstream movement of said cartridge insert, and said valve means being supported by said cartridge insert at the outlet end thereof.
 3. The nozzle according to claim 2 in which said valve means includes a single valve mounted at the outlet end of said cartridge insert, said valve having a first portion cooperating with the outlet of said first insert passage and a second portion cooperating with the outlet of said first insert passage and a second portion cooperating with the outlet of said second insert passage, said first and second portions being opened in response to pressurized fluid flow in said insert passages, said biasing means including a garter spring acting against said first and second portion, and further including a garter spring retainer mounted on said single valve so as to retain said garter spring on said valve.
 4. The nozzle according to claim 3 in which said single valve further comprises first and second protrusions projecting outwardly from said first and second portions for positioning said garter spring thereabouts whereby the biasing force of said garter spring is applied to the outer dimensions of said first and second portions.
 5. The nozzle according to claim 2 in which said valve means includes a single flapper valve mounted at one end of said member, said flapper valve having a thin central portion, a first outer portion adjacent one side of said central portion and a second outer portion adjacent the other side of said central portion, said first and second outer portions increasing in thickness from said central portion outward, a first protrusion projecting outwardly from adjacent the outer extremity of said first portion, a second protrusion projecting outwardly from adjacent the outer extremity of said second portion, said first outer portion cooperating with the outlet of said first insert passage to prevent communication between said first insert passage and said housing passage in the absence of pressurized fluid in said first insert passage, said second outer portion cooperating with the outlet of said second insert passage to prevent communication between said second insert passage and said housing passage in the absence of a pressurized fluid in said second insert passage, said biasing means including a garter spring mounted about the first and second protrusions and further including a retainer having a pair of channels formed therein, said retainer mounted on said central portion wherein said garter spring is restrained by said channels whereby the spring biasing force is applied at the outer extremity of said first and second portion to close said first and second insert outlets in the absence of pressurized fluid in the respective passages therein.
 6. The nozzle according to claim 1 further including a hollow cuplike member disposed in said housing passage between said cartridge insert and said nozzle valve means to reduce the volume in said housing passage in which fluid remains when fluid flow stops.
 7. A cartridge insert for use with a fluid dispensing nozzle to permit the nozzle to dispense two different fluids separately or together therefrom, the nozzle having an inlet adapted to receive a first fluid hose, a second fluid hose placed coaxially within the first hose, each hose being in communication with a source of different fluids, said nozzle inlet being in communication with a nozzle inlet passage, said cartridge insert comprising a first annular housing slidably mounted within the nozzle inlet passage downstream of the first hose, said annular housing defining a first cartridge inlet, said first inlet being in communication with said first hose, a second housing of lesser diameter than said first housing, said second housing defining a second inlet and adapted to cooperatively engage the end of the second hosE, a dividing wall providing separate passages within said first annular housing, the first passage being in communication with said first inlet and the second passage being in communication with said second inlet, each passage having an outlet at the downstream end of said insert, a valve mounted at the downstream end of said insert to open and close said first and second passage outlet in response to pressurized fluid therein, means normally biasing said valve closed in the absence of pressurized fluid in the passages to prevent communication between said passages when pressurized fluid is not present in both passages.
 8. The cartridge insert according to claim 7 in which said biasing means includes a garter spring, and in which said valve includes a single cylindrical flapper valve having a thin central portion, a first outer portion adjacent one side of said central portion and a second outer portion adjacent the other side of central portion, said first and second outer portions having a greater thickness than said central portion, a first protrusion projecting outwardly from adjacent the outer extremity of said first portion, a second protrusion projecting outwardly from adjacent the outer extremity of said second portion, said first and second protrusions cooperatively positioning said garter spring on said flapper valve, a retainer having a pair of slots formed therein to receive and restrain said garter spring when said retainer is secured to said central portion wherein the spring biasing force is applied at the outer extremity of said first and second portions by said garter spring whereby said first outer portion cooperates with said first passage outlet to close said outlet and whereby said second outer portion cooperates with said second outlet passage to close said outlet and whereby said first and second passages are only in communication with each other when there is pressurized fluid flow in each of said first and second passages.
 9. The cartridge according to claim 8 in which said flapper valve is connected to the end of said dividing wall.
 10. The cartridge according to claim 9 in which the cylindrical flapper valve is of lesser diameter than said first annular housing. 